[OpendTect_Users] Ridge enhancement filter: in 6 or 4 different directions?

[Paul de Groot]

Hello Robin,

The user doc is wrong. The ridge-enhancement filter compares similairities
in 4 directions: inline direction, crossline, 45 degrees and 135 degrees.

To better understand what's going on in the ridge enhancement filter I
suggest you open the "expert" version of the attribute set. This set shows
the complete chain of attributes that are computed by this filter. The
non-expert version hides all intermediate steps.

Here are a few references:


   - Brouwer. F, Huck.A, December 2011. An Integrated Workflow to Optimize
   Discontinuity Attributes for the Imaging of Faults.Download
PDF<http://www.dgbes.com/images/stories/PDF/browhuck.pdf>

   - Tingdahl, K. and de Rooij, M., 2005. Semi-automated detection of
   faults in 3D seismic data. Geophysical Prospecting pp 553–542.


Best regards,

Paul de Groot.
-- 
*Paul de Groot
President
dGB Earth Sciences, Nijverheidstraat 11-2, 7511 JM Enschede, The
Netherlands.
Tel. +31 53 43 15 155, Fax +31 53 43 15 104.
paul.degroot at dgbes.com, www.dgbes.com, www.opendtect.org.

*
To understand what is going on step by step I recommend

On Wed, Oct 3, 2012 at 11:27 AM, Robin MARCHANT <Robin.Marchant at unil.ch>wrote:

>  Hello,
>
> I have a problem understanding the ridge enhancement filter: the user
> documentation (
> http://opendtect.org/rel/doc/User/dgb/chapter11.9_ridge-enhancement_filtering.htm)
> states that "three neighboring similarity values in six different
> directions" are considered but the attribute formula seems to operate only
> in 4 different directions.
>
> So is it 4 or 6 directions?
>
> Furthermore, where can one find explinations for the Ridge enhancement
> filter expert parameters?
> --
>
> With my best regards,
>
>
> *Robin MARCHANT
> *Curator of geology and paleontology
> Geological State Museum
>
> UNIL - Bâtiment Anthropole
> CH-1015 Lausanne (Switzerland)
> Phone: 021 692 44 72; Fax: 021 692 44 75
> E-mail: Robin.Marchant at unil.ch
> Internet: www.unil.ch/mcg
>
> _______________________________________________
> Users mailing list
> Users at opendtect.org
> http://www.opendtect.org/mailman/listinfo/users
>
> You receive this mail because you are listed on users at opendtect.org To
> unsubscribe please go to http://lists.opendtect.org/mailman/options/users. If you encounter any problems, please contact
> support at opendtect.org .
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opendtect.org/pipermail/users/attachments/20121003/429bd494/attachment.html>